Eoswell van buskiek



UNITED STATES PATENT OFFICE.

ROSWELL VAN BUSKIRK, OF NEWARK, NEW JERSEY.

ExPANslvE ENVELOPE.

Specification forming part of Letters Patent No. 43,875, dated August 16, 1864.

To all zrhom it may concern:

Be it known that I, RosWELL VAN Bus- KIRK, of the city of Newark, in the county of Essex and State of New Jersey,have invented a new and Improved Envelope, to be called an Expansive Envelope 5 and I do hereby declare that the following is a full and exact description ot' the same, reference being had to the accompanying drawings, and to letters cf reference Inarked thereon.

The nature ot' my invention consists in putting a fold in the ends and bottom edge ot' an envelope, for the purpose of allowing it to expand or contract, while the sides are continued i'lat and parallel to each other. One or incre folds may be used,aecording to the thickness required.l

The same fold may be 'employed'to improve a portfolio by putting it in the lower edge, thus-allmving` vthe sides thereof to expand parallel with each other.

Figure l is a view of the whole unexpanded Wit-h tag projecting outward. Fig. 2 is a view of the Whole half expanded, with tag projecting outward. Fig. 3 is a View of the Whole halt expanded, with the tag folded across the end and labeled. Fig. 4 is a viewof the Whole fully expanded, with the tag folded across the end and labeled.

A represents the front side of an envelope; B, the flap; O O O, the folds, and D a tag attached to one end of the envelope, on which is labeled or indexed the contents of the en velopc. It is also intended as a handle to draw the package out from the depository.

The value of this improvement consists, first, in its portability-when unfilled, the envelope can be compressed and packaged up like other envelopes second, in its adaptation to parallel expansion of the sides as it is filled; third, having a at surt'aeefor the sides, it can conveniently be used as a writing-board, especially by putting an extra stii'ening in one or both sides; fourth, in the tag for indexing the contents ot' an envelope, as seen at D in Figs. 3 and 4, and also for drawing the package from the depository.

I claiin- The folds C O O and the tag D, for the purposes herein specified.

ROSWELL VAN BUSKIRK.

Witnesses:

H. HARRIS, P. P. SAUNIER. 

